Louis townsend



(No Model.)

' L. TOWNSEND.

GALL BELL SWITCH.

No. 850,024. Patented Sept. 28, 1886.

I m #-7 Nj t N @UVM/wwe@ I Suma/Lto@ UNITED STATES PATENT OFFICE.

LOUIS TOWNSEND, OF EVANSVILLE, INDIANA, ASSIGNOR OF ONE-HALF TO JOSEPH L. BAY AND WM. B. WORTHEN, OF LITTLE ROOK, ARK.

CALL-BELL SWITCH.

SPECIFICATION forming part of Letters Patent No, 350,024,dated September 28, 1886.

Application tiled May 10, 1886. Serial No. 201,734. y (No model.)

' T0 a/ZZ whom t may concern,.-

Be it known that I, LoUIs TowNsEND, of Evansville, in the county of Vander-burg and State of Indiana, have invented a new and Improved Call-Bell Switch for Telephone- Lines; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specificaro tion, in which- Figure l is a side elevation of the exterior of the box and switch. Fig. 2 is a vertical section ofthe same. Fig. 3 is a cross-section showing the spring-contact. Fig. 4 is a section through the sliding bolt.

The object of my invention is to provide a switch wherein the contacts shall be always bright and sure in connecting alternately with the ground of the bell-circuit and with the I 2o talking-circuit.

controlled by a stop or screw, t', that protrudes.

into a slot, t', in the housing. The length of this movement is sufficient to withdraw the contact-points carried by the ends of the sliding bolt and make new contacts. On the upper end ofthe bolt is a cross-head, e, having projecting pins f, one pair projecting outwardly and another pair vprojecting toward 4o the box-wall.

Fastened to the box-wall, immediately in line with the pins f, are two spring-contact devices made of three spring-ngers, g g g, yielding to the advance of the pairs of pins f in opposite planes. The fingers g have their ends lying in the pathof the travel. of the pins projecting toward the wall of the box, and as the bolt advances the pins ride up on the ends of the said ngers and make contact by a rubbing movement, keeping the surface free from 5o oxidation. At the saine time the outwardlyprojecting pins pass between and press apart the curved spring-fingers g g, and make additional and sure Contact also by a rubbing or scratching movement. These upper contact devices make the proper connections with the talking-circuit. Beneath the sliding bolt is a single contact device made, like the upper contacts, with three ingers, [/Hgg, and one pair of pins, f', engage and disengage, as in 6c the upper contacts. The lower contact device connects with the ground end of the ringing-circuit.

Vithin the wall of the box. at 71., is aspring, 7c, having its free end resting beneath the 65 shank of hook a', so as to keep it and sliding bolt b raised, so that the upper contacts engage with fingers g gg". The line-Wire is attached to spring k, and said spring conducts the current to fingers g g g. The resistance of spring 7c 7c is so calculated that the weight of the receiving-instrument hung on hook c overcomes the spring and draws down the hook, spring, and bolt until the lower contact-pins engage the spring-iingcrs gmg g5 and ground the ring- 7 ing-circuit. So long as the instrument remains in this condition-that is, with the receiver hung 0n the hook-call-signals may be transmitted. When a user takes the receiver lrom the hook, the spring rebounds and 8( carries the sliding bolt up to throw the talking-circuit into line.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The vertically-moving bolt I), having the hook a rigidly secured thereto, and provided at its ends with the projecting contact-pins ff', in combination with the housing d, three finger spring-contacts, g g g" g" g g5, and sup- 9| porting-spring k, all constructed, arranged, and operated substantially as set forth.

LOUIS TOWNSEND.

Witnesses:

I. W. Niixsmv, H. P. MCNAIR.

It is hereby certified that Letters Patent No. 350,024, granted September 28, 1886, upon the application of Louis Townsend, of Evansville, Indiana, for an improvement in Gall-Bell Switches, was erroneously issued to the said Louis Townsend and Joseph L. Bay and William B. Worthen, of Little Rock, Arkansas5 that said Letters Patent should have been issued to said Joseph L. Bay and William B. Worthcn, as assignees of the entire interest; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oilice.

Signed, countersigned, and sealed this 5th day of October, A. D. 1886.

[SEAL] H. L. MULDROW,

Acting Secretary of the Interior.

Countersigned R. B. VANCE,

Acting Commissioner of Patents. 

